JPH0533091Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of the Invention] The present invention is a multiplex system in which a primary station and a plurality of secondary stations are connected in a digital chain manner, and data is transmitted between the primary station and the secondary stations. This relates to the structure of a secondary station of a transmission device.

[Summary of the idea]

The secondary station of the multiplex transmission device according to the present invention has a transmission line terminal block provided with a terminal connected to the transmission line and the secondary station main body that are connected by a recess and an elastic protrusion provided in the side wall. The required number of secondary station main bodies are connected together to form a secondary station by mechanically connecting them together and electrically connecting them through connectors.

[Prior art and its problems]

(Prior Art) Conventionally, for example, when a control system is configured with a programmable controller and a plurality of sensors and actuators placed apart from the programmable controller, the programmable controller is used as a primary station, and a large number of sensors and actuators are connected to the programmable controller. A multiplex transmission device is often configured by connecting these as secondary stations, for example, in a digital chain. However, when connecting multiple secondary stations at one location in a digital chain, for example, as shown in Figure 7a, the input/output and power supply terminals of the transmission line are connected to each secondary station T-1, T-2... It is necessary to connect the transmission line L connected to the primary station and other secondary stations with a cable. The other terminals are on the secondary station body T-1 to T-5.
This is the input/output terminal of In order to facilitate such connections, each secondary station T-1 to
It is also conceivable to provide connectors C-1, C-2, . . . between T-5 and connect them to each other.

(Problems to be Solved by the Invention) However, with the cable connection as shown in FIG. 7a, there are problems in that it takes time and effort to configure the secondary station and there is a risk of connection errors. Also, connectors C-1 to C as shown in Fig. 7b
-4, there was a problem in that the terminals connected in the middle among the transmission input/output terminals of each secondary station were wasted.

[Technical issues]

The present invention has been developed in view of the problems with connection of conventional secondary stations, and it is an easy method to connect multiple secondary stations of multiplex transmission equipment to the same location. The technical challenge is to connect the terminals and eliminate wasted terminals.

[Structure and effect of the idea]

(Means for solving the problem) The present invention provides a secondary station of a multiplex transmission device in which a primary station and a plurality of secondary stations are connected in a digital chain manner, and data is transmitted between the primary station and the secondary stations. So, Figure 1~
As shown in FIG. 6, the terminal connected to the transmission line,
A connector socket located on the connection surface with the secondary station main body and connected to the terminal, one transmission line terminal block having a pair of recesses on the side surface of the connection surface, and the transmission line terminal block or two. A connector pin provided at a position corresponding to the connector socket on the connection surface with the next station body, a connector socket identical to the transmission line terminal block provided on a surface symmetrical to the connection surface, and a claw at the tip. at least one pair of elastic projections protruding from the connection surface, a recess on the side wall, a data transmission means connected between the data input/output terminal and the transmission line input/output connected to the transmission line terminal block, and transmitting data with the primary station; A transmission line terminal block and an arbitrary number of secondary station bodies are connected to each other.

(Function) According to the present invention having such characteristics, a transmission line terminal block is used which is connected to the primary station and other secondary stations via transmission lines. Then, an arbitrary number of secondary station bodies are mechanically connected to the transmission line terminal block by fitting the elastic projections and recesses provided on the side wall, and electrically connected between them by a connector. It constitutes a secondary station.

(Effect of the invention) Therefore, according to the invention, by sequentially connecting the required number of secondary station bodies to the transmission line terminal block, it is possible to electrically connect the transmission line terminal block and the secondary station body. can. Therefore, compared to connections using cables, wiring work is not required, any number of secondary station bodies can be connected extremely easily, and there is no possibility of connection errors. Further, since the transmission line terminal block has only terminals for transmission and each secondary station main body has terminals for input/output, there are no wasted terminals and all terminals can be used effectively.

[Explanation of Examples]

FIG. 1 is an assembled configuration diagram showing an embodiment of a secondary station according to the present invention, and FIG. 2 is a perspective view thereof. In these figures, the secondary stations are transmission line terminal blocks 1 and 2.
It consists of the next station bodies 2, 3, and so on. The transmission line transmission line terminal block 1 is provided with a plurality of terminals 4a to 4d, as shown in a perspective view in FIG. terminal 4
Terminals a and 4b are power input terminals to which a DC voltage of 24V is applied, for example, terminals 4c and 4d are transmission terminals, and 4c is an output terminal for connecting to another secondary station. A transmission line input from a primary station or an upper secondary station is connected to 4d. The transmission line terminal block 1 has a printed circuit board for fixing the terminal fittings of each terminal 4a to 4d and connecting the terminal to a socket, as shown in FIG. 3 as a bottom perspective view and FIG. 4 as a vertical cross-sectional view. A substrate 5 is provided, and a connector socket 6 is provided at one end thereof. The connector socket 6 shall be attached from within the hole 7 on the connection surface of the transmission line terminal block 1. Further, the side wall of the transmission line terminal block 1 is provided with recesses 8 and 9 at positions corresponding to elastic projections of the secondary station main body 2, which will be described later, for engaging the claws of the elastic projections to connect the secondary stations.

Since each of the secondary station main bodies 2, 3, . . . has the same structure, the secondary station main body 2 will be explained below.
As shown in perspective views in FIGS. 1 and 2, the secondary station main body 2 has an elastic member having claws 11a and 12a at one end, respectively, for connection to the transmission line terminal block 1 or the upper secondary station main body. Protrusions 11 and 12 are provided. Further, on the connecting surface of the secondary station body 2 with the transmission line terminal block 1, a connector pin 13 from which a connecting terminal projects is provided at a position corresponding to the connector socket 6, as shown in FIG. A connector socket 14 is provided on a surface symmetrical to the connector pin 13, similar to the connector socket 6 of the transmission line terminal block 1, and the other two are connected to the left and right sides of the socket by engaging claws of elastic protrusions. Recesses 15 and 16 are provided to connect the main body of the next station.
The secondary station main body 2 has a data transmission means for transmitting data with the upper station as described later, and has an input/output means for inputting and outputting data to be sent to the primary station or data given from the primary station. Terminals 17a to 17d and unillustrated terminals 17e to 17f are provided on both sides thereof. Further, a display for displaying the input/output status of the secondary station 2 and a display for displaying the power supply status are provided on its surface.

FIG. 5 is a block diagram showing the electrical configuration inside the secondary station main body 2. As shown in FIG. In this figure, when the secondary station main body 2 is connected to the transmission line terminal block 1, terminals 4a to 4d
and the terminal 13 of the connector pin 13 connected via the connector socket 6 and the connector pin 13, respectively.
a, 13b are directly connected to terminals 14a, 14b of a connector socket 14 located symmetrically to the connector pin 13, and further connected to a power supply circuit 21 in the secondary station body 2. The power supply circuit 21 supplies power to each section within the secondary station 2. Further, the terminal 13c of the connector pin 13 is directly connected to the terminal 14c of the connector socket 14. Connector pin 1
A low-pass filter 22, a polling signal receiving circuit 23, and an address signal receiving circuit 24 are connected to the terminal 13d of No. 3. The low pass filter 22
This is a passive filter consisting of an LC, which is used during address setting regardless of the power supply state, and blocks high frequency polling signals given from the primary station or the upper secondary station itself. The address signal and data signal given from the main body are transmitted as they are to the socket terminal 14d, and the socket terminal 1
The address signal and data signal given from 4d are directly transmitted to the terminal 13d of the connector pin 13. When receiving a polling signal, the polling signal receiving circuit 23 sets an address buffer 25 to set the address of the secondary station itself, and also provides the polling signal transmitting circuit 26 with the polling signal sending timing. The address signal receiving circuit 24 transfers the address signal applied from the connector pin terminal 13d to an address buffer 25.
is given to the comparator 27. The polling signal transmitting circuit 26 is a transmitting circuit that transmits a polling signal to the subsequent secondary station main body 3 connected to the terminal 14d of the socket 14, and then transmits the polling signal to the comparator 2.
An operation start signal is given to 7. The comparator 27 compares the address received by the address signal receiving circuit 24 with the address held in the address buffer 25, and if the addresses match, it outputs a signal that enables data transmission and reception. The signal is applied to the transmitting/receiving circuit 28. Data transmission/reception circuit 28
is connected to the input/output terminal group 17a to 17h of the secondary station main body 2 via the input/output interface 29, and sends the data given to the input terminals to the primary station and receives data from the primary station. Data is outputted to the output terminal via the input/output interface 29. The blocks 22 to 29 constitute data transmission means of the secondary station main body 2.

The secondary station main body constructed in this way is connected to the transmission line terminal block 1 as shown in FIG. They are fitted and connected by. A shorting pin 30 is connected to the connector socket 14 in the secondary station main body at the rear end of the secondary station constructed in this manner, for example, the secondary station 3, as shown in FIGS. 1 and 6. The shorting pin 30 short-circuits the socket terminals 14c and 14d of the secondary station main body at the rear end. In this way, the transmission line output end of the last secondary station main body is connected to the terminal 4c of the transmission line terminal block 1 via the socket and connector pin of each connected secondary station. Therefore, one end of the transmission line of the primary station or the upper secondary station is connected to the terminal 4d of the transmission line terminal block 1, and the terminal 4c is connected to the subsequent secondary station at a distant position by a cable (not shown). By connecting them, it is possible to configure a secondary station using one transmission line terminal block without providing a transmission line terminal block on the side of the secondary station main body at the rearmost end.

[Brief explanation of the drawing]

Fig. 1 is an assembled configuration diagram showing one embodiment of the secondary station of the present invention, Fig. 2 is a perspective view of one secondary station body, Fig. 3 is a bottom view of the transmission line terminal block 1, and Fig. 4 5 is a block diagram showing the electrical configuration of the secondary station main body according to this embodiment, and FIG. 6 is a block diagram showing the electrical configuration of the secondary station main body according to this embodiment. The perspective views of the secondary station, FIGS. 7a and 7b, are diagrams showing the connection state of a plurality of conventional secondary stations connected. 1... Transmission line terminal block, 2, 3... Secondary station main body,
4a-4d...terminal, 6,14...connector socket, 8,9,15,16...recess, 11,12
...Elastic protrusion, 13...Connector pin, 13a~
13d... Connector pin terminal, 14... Connector socket, 14a to 14d... Socket terminal, 3
0...Short pin.

Claims (1)

[Scope of Claim for Utility Model Registration] A secondary station of a multiplex transmission device in which a primary station and a plurality of secondary stations are connected in a digital chain manner and data is transmitted between the primary station and the secondary stations, a transmission line terminal block having a terminal connected to the line, a connector socket located on the connection surface with the secondary station main body and connected to the terminal, and a pair of recesses provided on the side surface of the connection surface; , a connector pin provided at a position corresponding to the connector socket on the connection surface with the transmission line terminal block or the upper secondary station main body, and a connector pin provided on a surface symmetrical to the connection surface, which is the same as the transmission line terminal block; a connector socket, at least one pair of elastic protrusions having a claw at the tip and protruding from the connection surface, a recess on the side wall, a data input/output terminal and a transmission line input/output connected to the transmission line terminal block; a plurality of secondary station bodies having data transmission means for transmitting data with the primary station;
A secondary station of a multiplex transmission device, comprising: the transmission line terminal block and an arbitrary number of secondary station bodies connected to each other.